Beechen has written scripts for various cartoons, such as Teen Titans, The Wild Thornberrys, Rugrats, Pink Panther and Pals, Scooby-Doo!
Mystery Incorporated, Transformers: Power of the Primes, The Batman, Edgar and Ellen, Littlest Pet Shop, Little Bill, The VeggieTales Show, Thomas & Friends: All Engines Go and the Ben 10 franchise.
Beechen has written for the Nickelodeon live-action series, Ned's Declassified School Survival Guide, and for the short-lived drama Savannah.
Beechen wrote several Rugrats, The Wild Thornberrys and Rocket Power comic strips for Nickelodeon Magazine.
At the New York Comic Con, Wildstorm announced he would be writing a new series, Killapalooza, with Trevor Hairsine on art duties.